In older films, families blended instantly upon marriage. In modern cinema, the friction is the plot. Characters are allowed to dislike each other. They are allowed to be jealous of the time their parent spends with a new spouse. Movies like Tully or Everybody’s Fine acknowledge that step-siblings and half-siblings exist in a complex hierarchy of affection and rivalry.
Recent research and film analyses identify several recurring themes that define modern blended family dynamics:
leave 15% of the mess unresolved. Because that’s real life.